Photo: Hector Bottai / CC BY-SA 4.0 (Wikimedia Commons)
Yellow-margined Flatbill
Tolmomyias assimilis
Yellow-margined Flatbill (Tolmomyias assimilis) — Songbirds & Perching Birds of South America.
Found across 8 guides in our atlas — open any for the full checklist, photos and what's around right now.
The Yellow-margined Flatbill (Tolmomyias assimilis) is a member of the Tyrannidae family found in South America. Adults weigh 17 g. The IUCN Red List lists it as Least Concern.
Conservation status
IUCN Red List (opens in a new tab)Widespread and abundant — not currently at risk.
Where it fits
- Class Aves
- Order Passeriformes
- Family Tyrannidae Tyrant Flycatchers, Calyptura
- Genus Tolmomyias
- Species assimilis
Quick facts
- Weight
- 17 g
- Diet
- Invertebrate-eaters
- Family
- Tyrannidae
- Order
- Passeriformes
- Habitat
- Woodland
How to identify
Similar birds
Least Concern
Least Concern
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Biology & behaviour
Diet
The Yellow-margined Flatbill is a invertivore — it feeds mainly on invertebrates such as insects and other small prey.
Behaviour
A bird of dense forest, it spends much of its time perched in trees and shrubs.
Migration
The Yellow-margined Flatbill is largely sedentary, staying within its range year-round rather than making regular long-distance migrations.
The Yellow-margined Flatbill (Tolmomyias assimilis) is a species of bird in the Tyrannidae family, part of the order Passeriformes. It occurs naturally across South America. Its distribution covers SA Amazonia.
It is a small bird. Adults weighs around 17 g, with a wing length of about 6.3 cm and a tail of around 5 cm.
The IUCN Red List currently assesses it as Least Concern. That category covers species that remain widespread and reasonably abundant in the wild.
The species has a mapped global range of roughly 5.9 million km².
Songs & calls
Frequently asked questions
How big is the Yellow-margined Flatbill?
The Yellow-margined Flatbill is a small bird that weighs around 17 g.
Where does the Yellow-margined Flatbill live?
The Yellow-margined Flatbill is found across South America with a range covering SA Amazonia, where it is typically found in wooded and forested habitats.
What family does the Yellow-margined Flatbill belong to?
The Yellow-margined Flatbill (Tolmomyias assimilis) belongs to the Tyrannidae family, in the order Passeriformes.
What does the Yellow-margined Flatbill eat?
The Yellow-margined Flatbill is a invertivore — it feeds mainly on invertebrates such as insects and other small prey.
Does the Yellow-margined Flatbill migrate?
The Yellow-margined Flatbill is largely sedentary, staying within its range year-round rather than making regular long-distance migrations.
Is the Yellow-margined Flatbill endangered?
The IUCN Red List currently assesses it as Least Concern That category covers species that remain widespread and reasonably abundant in the wild.
What sound does the Yellow-margined Flatbill make?
1 real field recording of the Yellow-margined Flatbill — including its begging call — can be played in the Songs & calls section on this page, credited to the recordist who captured it.
How large is the Yellow-margined Flatbill's range?
The Yellow-margined Flatbill has a mapped global range of about 5.9 million km².
Conservation
Every bird benefits from bird-safe windows, native plants, and keeping cats indoors. Small changes at home add up to real protection.
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Guides for this bird
Best Bird Feeders for Garden Songbirds
How to choose a bird feeder for garden songbirds — the feeder styles compared, the seed they prefer, where to hang it, and how to keep birds safe. A decision framework grounded in real data, with no mystery picks.
Meet the Tyrannidae
A field guide to the Tyrannidae family — 444 species in the Birbs encyclopedia, with the best-known members to start with.